Table 1.

Means and standard deviations of pre- and post-treatment values, pre- and post-waiting-list values, and significance of ANCOVA group effects.

Measures	BRT		WL		df	F ratios for group effects	d^a
Measures	Pre-TX	Post-TX	Pre-WL	Post-WL	df	F ratios for group effects	d^a
Anxiety-related psychopathology
PDSS (0–4)	2.14 (0.65)	0.69 (0.45)	1.98 (0.87)	1.95 (0.67)	2,34	63.10^***	2.21
SDS (0–10)	2.47 (2.45)	0.73 (0.92)	3.20 (2.25)	2.77 (2.17)	2,33	21.05^***	1.22
ASI (0–4)	1.86 (0.83)	0.92 (0.64)	1.86 (0.86)	1.58 (0.72)	2,33	23.45^***	0.97
MI-AAL(1–5)	1.86 (0.60)	1.45 (0.46)	2.20 (0.65)	2.06 (0.71)	2,33	7.81^**	1.02
BDI (0–63)	11.15 (8.41)	4.15 (3.51)	13.47 (7.51)	11.44 (7.79)	2,33	14.45^**	1.21
Basal respiration during quiet sitting
QS/pCO₂	32.16 (4.79)	34.59 (4.98)	32.22 (3.98)	31.52 (5.41)	2,34	3.72⁺	0.59
QS/RR	11.57 (5.03)	9.27 (4.10)	12.26 (3.15)	13.98 (3.57)	2,34	19.94^***	1.23
Respiratory activation during recovery from hyperventilation
VH/pCO₂	30.29 (5.05)	36.18 (4.22)	31.63 (4.33)	30.75 (9.05)	2,31	5.11^*	0.77
VH/RR	11.82 (4.37)	9.21 (4.23)	11.68 (3.43)	12.68 (4.27)	2,32	9.88^**	0.82

BRT, Capnometry-assisted breathing training; WL, waitlist control; PDSS, Panic Disorder Severity Scale; SDS, Sheehan Disability Scale; ASI, Anxiety Sensitivity Index; MI-AAL, Mobility Inventory (alone); BDI, Beck Depression Inventory; QS/pCO_2, pCO₂ during quiet sitting; QS/RR, respiration rate during quiet sitting, VH/pCO₂, recovery pCO₂ after hyperventilation; VH/RR, recovery respiration rate after hyperventilation.

Cohen’s d was calculated to determine the effect size for differences between BRT and WL groups at posttreatment

^***

p<.001;

^**

p<.01,

p<.05,

⁺

p<.10